Gday Karl
As i mentioned, you need an app that can send data out on a COM port.
Putty is free and works on win 10
You then short the relevant pins on the plug of the adapter so that the sent data gets routed back via the received data line.
ref piccy of the wiring of the plug for the comms into the mount
If you send some data and it comes back, you know the converter itself is working.
Andrew
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